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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4af34fab516a581e59c1f635c7b3a0232b13a801c248ae63a21cd75d6fbac4b' 
  AND token = 'HMzfSiDUJypE34c7wSlQFlDL+4vf9WjMZL6XE4EkTx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}